Always aim for the dead centre of their chest, shoot at ranges that will do more than 18 damage per hit (turn on damage counters for this, helps loads), allow your enemies to get up in your face. Also stay calm when using it so you don't shoot all over the place. A single well-aimed shot can hit a close enemy for 100+ damage.

If I airblast can I link it into a "meatshot" or doesn't it fuction like a flaregun (Flaregun+degreaser) combos)

To get this thread off to a nice TF2-unrelated start I thought I'd mention that in a game of Operation Firestorm one of my teammates was giving free skydiving jumps from what was meant to be our transport-attack helicopter.

The view from the top of the map is actually pretty nice, I'd love to see this done on Caspian Border.